Chautauqua Auditorium - Credit: Wikimedia Commons
The Chautauqua Auditorium, built in 1903, is a large historic icosagonal (20-sided) wooden chautauqua meeting hall located at Forest Park and North East 9th Street, Shelbyville, Illinois, United States. On January 30, 1978, it was added to the National Register of Historic Places. Read more on Wikipedia
Source: en.wikipedia.org